   Chapter 5, Problem 6P

Chapter
Section
Textbook Problem

A horizontal force of 150 N is used to push a 40.0-kg packing crate a distance of 6.00 m on a rough horizontal surface. If the crate moves at constant speed, find (a) the work done by the 150-N force and (b) the coefficient of kinetic friction between the crate and surface.

(a)

To determine
The work done by the force.

Explanation

Given Info:

The horizontal force used is 150N .

The mass of the crate is 40.0kg .

The distance created by the force is 6.00m .

Formula to calculate the work done by the force is,

WF=(Fcosθ)d

• θ is the angle between the force applied and the displacement vector
• F is the force applied
• d is the displacement vector

Since the force and the displacement are in the same direction, angle θ is zero.

Substitute 150N for F, zero for θ and 6

(b)

To determine
The coefficient of kinetic friction between the crate and the surface.

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